GOST 21427.1-83

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  ГОСТ 21427.1-83

GOST 21427.1−83 cold-rolled anisotropic electrotechnical Steel sheet. Technical specifications (with Changes 1−5 N)

GOST 21427.1−83
Group B33

INTERSTATE STANDARD

THE COLD-ROLLED ANISOTROPIC ELECTROTECHNICAL STEEL SHEET

Specifications

Cold-rolled anisotropic electrical-sheet steel. Specifications

ISS 77.140.50
OKP 09 9400

Date of introduction 1984−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of metallurgy of the USSR

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 21.06.83 N 2610

3. REPLACE GOST 21427.1−75

4. THE STANDARD FULLY COMPLIES ST SEV 102−85

5. REFERENCE AND NORMATIVE-TECHNICAL DOCUMENTS

The designation of the reference document referenced	Item number
GOST 427−75	4.2
GOST 4381−87	4.2
GOST 6507−90	4.2
GOST 7566−94	3.1; 3.5; 5.1; 5.1.3
GOST 12119.0−98 — GOST 12119.8−98	4.6; 4.8; 4.9; 4.13
GOST 26877−91	4.3

6. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

7. EDITION Changes N 1, 2, 3, 4, 5, approved in December 1985, October 1986, June 1987, September 1988, December 1990 (IUS 4−86, 1−87, 11−87, 1−89, 4−91)


This standard applies to thin cold-rolled anisotropic electrical steel, used in magnetic circuits of electrical machines, transformers and devices.

The standard contains all the requirements of ST CMEA 102 and sets more stringent requirements to limit deviations on thickness, flatness 1-grade rolled steel and the number of kinks (see Annex 5 on the compliance of the requirements of this standard the requirements of the standard CMEA).

(Changed edition, Rev. N 2).

1. ASSORTMENT

1.1. Manufactures steel stamps: 3311 (3411), 3411, 3412, 3413, 3414, 3415, 3404, 3405, 3406, 3407, 3408, 3409.

(Changed edition, Rev. N 4, 5).

1.2. Steel classification:

by product: sheet, rolled steel, cut strip (ribbon);

precision of rolling thickness:

normal accuracy — N,

high accuracy — P;

accuracy of manufacturing width:

normal exactly

increased accuracy — sh;

flatness for classes 1 and 2;

for camber (for steel coils and strips):

normal exactly

increased accuracy — With;

by type of coverage:

without cover (with metal surface),

without insulation coating (no extra coating, but with a soil layer) — BP,

with insulating heat-resistant coating — ET,

coated without impairing stanoevski, — M (soft),

with insulating heat-resistant coating that improves stanoevski, — SH,

with permastone insulating coating that improves stanoevski, — NSH;

the fill factor of steel coated groups A and B;

the level of residual stresses:

the normalized stress — HE

without standardization of voltages.

(Changed edition, Rev. N 5).

1.3. Rolled steel manufactured with the thickness of 0,27; 0,30; 0,35; 0,50; 0,70 and 0,80 mm and width of 650, 700, 750, 800, 865 and 1000 mm.

The size of the sheets shall be as specified in table.1.

Table 1

mm

Thickness	Length sheets with a width of
650	700	750	800	865	1000
0,27	1500	1500	1500	1500	1500	-
0,30	1500	1500	One thousand five hundred	1500	1500	2000
0,35	1500	1500	1500	1500	1500	2000
0,50	1500	1500	1500	1500	1500	2000
0,70	-	-	1500	-	-	-
0,80	-	-	1500	-	-	-

Note. Steel coils and sheets thickness 0,70, 0,80 mm and a width of 750 mm are made only of steel grade 3311.


(Changed edition, Rev. N 4, 5).

1.4. Pieces of tape are manufactured with a thickness of 0,27; 0,30; 0,35 and 0,50 mm, width 90; 170; 180; 190; 200; 240; 250; 300; 325; 360; 400; 465 and 500 mm.

By agreement with the consumer allowed to make another tape of an intermediate width.

(Changed edition, Rev. N 1).

1.5. The mass of one cut roll of tape shall be not less than the mass calculated from the rate of 0.5 kg per 1 mm of belt width.

1.6. Maximum deviations in thickness of steel shall be as specified in table.2.

Table 2

mm

Thickness	Limit deviation on thickness of steel with precision rolling
normal	high
0,27; 0,30	±0,02	±0,01
0,35	±0,03	±0,02
0,50	+0,03	+0,02
-0,04	-0,03
0,70	±0,05	-
0,80	±0,05	-

1.5, 1.6. (Changed edition, Rev. N 5).

1.7. Sheets, steel coils and strips are produced with obraznymi edges.

1.8. Maximum deviations of steel coil and sheets should not exceed on width: normal accuracy +0,5%; increased accuracy +1.0 mm.

Limit deviation of leaves along the length shall not exceed +0,5%.

1.9. Tolerances for the width of the tape shall be as specified in table.3.

Table 3

mm

Tape width	Maximum deviation in precision manufacturing
normal	high
Up to 250	+0,8	+0,5
SV. 250 to 500	+1,2	+0,5

1.10. Longitudinal and transverse thickness variation sheets, cuts steel coils or strips of 1500 mm length and transverse thickness variation of rolled steel shall not exceedthe sum of limit deviations for thickness. For steel coils of thickness 0.50 mm high precision rolling transverse thickness variation should not exceed 0.02 mm.

1.11. Warpage should not exceed the limits specified in table.4.

Table 4

Steel	The nonplanarity of steel in 1 m, mm, for classes
1	2
Sheet	4	8
Rolled steel	2	4
Tape	5	10

Notes:

1. Rolled steel with a thickness of 0.35 mm or less flatness of the 2nd class is allowed to produce by agreement between manufacturer and consumer.

2. The nonplanarity of steel with a thickness of 0.70 to 0.80 mm and should not exceed 8 mm.


(Changed edition, Rev. N 5).

1.12. The ratio of height flatness to its length shall be those specified in table.5.

Table 5

Steel	The ratio of height flatness to its length, %, not more, for steel grades
1	2
Sheet, strip	2	3
Rolled steel	1	2

Note. For steel with a thickness of 0.70 mm and 0.80 the ratio of height flatness to its length should not exceed 5%.


(Changed edition, Rev. N 4, 5).

1.13. Camber of steel coil and strips 1 m of length should correspond specified in the table.6.

Table 6

mm

Width	The precision of rolling thickness
normal	increased
170 to 250 incl.	3	2
SV. 250	2	1

1.14. Basically a telescoping of rolls must not exceed:

5 mm steel with a width up to 500 mm;

7 mm steel with a width of 500 mm or more.

The individual coils must not protrude more than five times the thickness of the steel. One or two inner or outer coil can protrude above the surface of the end coil.

1.15. The inner diameter of the roll shall be (500±10) mm. Outer diameter of coils of strips shall be not more than 1200 mm, roll steel — no more than 1300 mm.

Examples of symbols:

Steel coils thick 0.35 mm, width 800 mm, high precision rolling, normal accuracy in width, high accuracy on camber, with flatness class 1, with insulating heat-resistant coating, with a fill factor of group A, with a normalized stress of steel grade 3406:

Roll 0,35х800-P-s-1-ET-A-HE 3406 GOST 21427.1−83

Tape thickness 0.30 mm, width 250 mm, normal precision rolling, high precision manufacturing in width, normal accuracy on camber, with the nonplanarity of class 2, with insulating heat-resistant coating, with a fill factor of group B, steel grade 3412:

Tape 0,30х250-N-W-2-AT-B-3412 GOST 21427.1−83

Sheet thickness 0.50 mm, width 700 mm, length 1500 mm, high precision rolling, normal accuracy in width, with flatness class 2, without insulating coating, with the fill factor, of steel grade 3413:

Sheet 0,50х700х1500-P-2-BP-3413 GOST 21427.1−83

Sheet thickness 0.80 mm, width 750 mm, length 1500 mm, normal precision rolling, normal accuracy in width, uncoated metal surface of steel grade 3311:

Sheet 0,80х750х1500-N-3311 GOST 21427.1−83

(Changed edition, Rev. N 5).

2. TECHNICAL REQUIREMENTS

2.1. Electrotechnical steel shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

2.2. Steel is manufactured in heat treated condition.

2.3. Steel produce:

thickness 0,27; 0,30 and 0,35 mm coated FLOOR and BP;

thickness 0.50 mm — with covers of M, SH and NSH;

thickness 0,70 mm — without coating and with coatings TSH and NSH;

thick 0.80 mm — without coating.

2.4. Steel surface should be free of rust, peeling of the film and the scale. Not allowed on the steel surface, made without insulating coatings, the presence of plaque powdery substances that hinder the coating application.

On the surface of the steel allowed the color of the tint and prints a depth or height not exceeding the sum of limit deviations for thickness.

2.5. Not allowed on the edges of the burrs are bigger than the sum of limit deviations for thickness.

2.3−2.5. (Changed edition, Rev. N 5).

2.6. The number of bends shall be not less than specified in table.7.

Table 7

Thickness, mm	The number of kinks
for each sample	for the tested samples (arithmetic mean)
0,27 and 0,30	1	4
0,35	1	3
0,50	1	2
0,70 and 0,80	1	-

At customer’s request, the tape thickness of 0.35 mm and less for wound cores are manufactured with a number of bends not less than two.

2.7. The magnetic properties of steel grades 3311, 3411, 3412, 3413, 3414, 3404, 3405, 3406, 3407, 3408 and 3409 depending on the thickness should conform to the standards specified in table.8.

Table 8

Thickness, mm	Steel grade	Specific magnetic loss W/kg, not more			Magnetic induction, T, not less, when the intensity of a constant magnetic field, Vehicles
			100	2500
0,80	3311	4,0	-	-	-	1,75
0,70	3311	3,8	-	-	-	1,75
0,50	3411	-	2,45	-	-	1,75
3412	-	Of 2.00	-	-	1,80
3413	-	1,75	-	-	1,85
3414	-	1,50	-	-	Of 1.88
0,35	3411	-	1,75	-	-	1,75
3412	-	1,50	-	-	1,80
3413	-	1,30	-	-	1,85
3404	-	-	1,60	1,60	-
3405	-	-	1,50	Of 1.61	-
3406	-	-	1,43	1,62	-
3407	-	-	1,36	1,68, 1,72*	-
3408	-	-	1,30	1,71, 1,74*	-
3409	-	-	1,24	1,72, of 1.74	-
0,30	3412	-	1,30	-	-	1,80
3413	-	1,19	-	-	1,85
3404	-	-	1,50	1,60	-
3405	-	-	1,40	Of 1.61	-
3406	-	-	1,33	1,62	-
3407	-	-	1,26	1,68, 1,72*	-
3408	-	-	1,20	1,71, 1,74*	-
3409	-	-	1,14	1,72, 1,74*	-
0,27	3413	-	1,15	-	-	1,85
3405	-	-	1,38	Of 1.61	-
3406	-	-	1,27	1,62	-
3407	-	-	1,20	1,68, 1,72*	-
3408	-	-	1,14	1,71, 1,74*	-
3409	-	-	Of 1.08	1,72, 1,74*	-

________________
* Enforced from 01.01.94.

Notes:

1. Allowed a measure of magnetic induction in an alternating magnetic field frequency of 50 Hz, while the norms decrease by 0,01 TL. When differences are accepted values measured in a constant magnetic field.

2. Businesses Minielektrostantsii rolled steel thickness of 0.35; 0.30 and 0.27 mm produce only brands 3405, 3406, 3407, 3408, 3409.

2.6, 2.7. (Changed edition, Rev. N 4, 5).

2.7.1. (Deleted, Rev. N 5).

2.8. (Deleted, Rev. N 4).

2.9. The magnetic properties of strip from steel grades 3413, 3414 and 3415 have to conform to the standards specified in table.10.

Table 10*

________________
* Table 9. (Deleted, Rev. N 4).

Steel grade	Thickness, mm	Specific magnetic loss W/kg, not more		Magnetic induction, T, not less, in magnetic field, A/m
		One hundred	2500
3413	0,35	1,30	1,90	1,58	1,85
3414	0,35	1,10	1,60	1,60	Of 1.88
3415	0,35	1,03	1,50	Of 1.61	1,90
3413	0,30	1,19	1,75	1,58	1,85
3414	0,30	1,03	1,50	1,60	Of 1.88
3415	0,30	0,97	1,40	Of 1.61	1,90

Note. The main standard characteristics are specific magnetic losses in the magnetic induction of 1.5 T and the magnetic induction in magnetic field of 2500 A/m.

2.10. Residual stress for steel of grade 3405, 3406, 3407, 3408 and 3409 shall not exceed 5%.

(Changed edition, Rev. N 3, 5).

2.11. The coefficient of aging on specific magnetic losses shall not exceed for steel grades 3311, 3411, 3412, 3413, 3414, and 3415 — 4%; for steel grades 3404, 3405, 3406, 3407, 3408 and 3409 — 2%.

In case of exceeding the ratio of aging the steel is allowed to approve mark corresponding to the level of losses measured on samples after aging.

(Changed edition, Rev. N 1, 4, 5).

2.12. Insulating heat-resistant coating of steel (ET), neutral to transformer oil at 100 °C and oil-resistant at 150 °C should meet the following requirements:

thickness on one side less than 5 microns;

coefficient of resistance — not less than 10 Ω·cm;

to maintain electrical insulation properties after heating to 800 °C for 3 h in neutral atmosphere or after aging at a temperature of (820±10) °C for 3 min in air;

does not flake off during bending of the sample.

Insulating heat-resistant coating that improves stanoevski (TS) shall meet requirements:

does not flake off during bending of the sample;

have a coefficient of resistance of not less than 1.0 Ω·cm(ТШ1);

save the specified value of the resistance coefficient after heating to 700 °C for one and a half hours in a neutral atmosphere or 2 min on the air.

Permastone insulating coating that improves stanoevski (NSH), must meet the following requirements:

does not flake off during bending of the sample;

have a coefficient of resistance of not less than 20 Ω·cm(НШ20);

save the specified value of the resistance coefficient after heating to 200 °C for 24 h.

(Changed edition, Rev. N 1, 5).

2.13. (Deleted, Rev. N 5).

2.14. The fill factor of the steel must conform to the standards specified in table.11.

Table 11

Thickness, mm	The fill factor, at least for steel
coated BP	coated SH, NSH	coated This for groups
And	B
0,27	0,95	-	0,95	0,94
0,30	0,96	-	0,96	0,95
0,35	0,97	-	0,97	0,96
0,50	-	0,95	-	0,97

Note. The fill factor for steel with a thickness of 0.50 mm coated with NSH prior to 01.01.93 rejection symptom was not determined for this set of statistics.

2.15. On demand of the consumer steel is manufactured with standard:

magnetic induction for other values of magnetic field strength indicated in the table.8*;

specific magnetic losses at different values of magnetic induction indicated in the table.8*;
________________
* Norms are established by agreement between manufacturer and consumer.


specific magnetic losses at the same value of the magnetic induction and the magnetic induction at a single value of the magnetic field in accordance with table.10.

In coordination with the consumer establishes additional requirements for steel:

the quality of the surface;

according to the type and quality of insulation coating;

for precision manufacturing in width.

2.16. Value of magnetostriction of steel are given in Appendix 1A, the density and electrical resistivity in Annex 2.

2.14−2.16. (Changed edition, Rev. N 5).

3. ACCEPTANCE RULES

3.1. Sheets, steel coils and strips take parties.

The party must consist of one roll of a pack of sheets or the riots of the ribbon of steel of the same brand, same size and be accompanied by a document of quality in accordance with GOST 7566.

(Changed edition, Rev. N 5).

3.2. Control the size, thickness variation, flatness, camber, surface condition and edges, testing for inflection, magnetic properties, residual stress, the quality of the coating is carried out on every roll and bundle.

The tape and sheets obtained by cutting one coil at a predetermined width and length, such as one roll.

The coil, consisting of a steel two parties, the consumer controls how single roll.

3.3. Determination of ageing factor, fill factor and sound insulating properties of the coating, the manufacturer conducts periodic at least once per quarter of ten rolls or packs.

If unsatisfactory results of the periodic tests tests translate into acceptance until a positive result for three parties in a row.

(Changed edition, Rev. N 1, 2, 5).

3.4. If you change the basic formulations or methods of applying electrical-insulating heat-resistant coatings carried out standard tests of neutrality to transformer oil and malostonski on one roll or pack.

3.5. If unsatisfactory validation results at least one of the indicators of re-examination it is carried out according to GOST 7566.

4. TEST METHODS

4.1. For testing from the beginning and end of each coil cut the same segment of a length of 1500−2000 mm, the bundle is taken uniformly over the height of two sheets.

4.2. The dimensions of the steel check of the measuring tool, providing the necessary accuracy of the measurement: the thickness with a micrometer (GOST 6507 or GOST 4381), the width of a metal line (GOST 427) or by other measurement means appropriate accuracy.

The thickness of each of the selected and control lines, or sheets measured at four points located in the middle of each side cut or sheet at a distance of not less than 20 mm from the edges. The thickness of each measurement point must meet the established standards. Check thickness variation by measuring the thickness.

4.3. To determine flatness and camber cut of the roll, tape or sheet is laid freely on a flat plate, making sure that the corners are snug against the plate.

The nonplanarity of the measured pattern, a ruler or a special device in the areas of maximum gap or cut sheet from the plate. Warpage should not exceed the permissible values for the segment length.

Camber is measured meter line in places of the greatest deviation of a side edge of the cut tape from a straight line.

Deviation from flatness (warpage), camber and thickness variation is determined according to GOST 26877.

4.2, 4.3. (Changed edition, Rev. N 5).

4.4. The surface condition and edges checked by inspection, without the use of magnifying devices.

4.5. Testing the bend of each segment or sheet is cut on two samples with a width of 20−40 mm, with no visible burrs. Samples subjected to further heat treatment. If there are differences in the used samples having a width of 30 mm. the Samples cut along the direction of rolling. One sample is cut at a distance of 30−90 mm from the edge, the other of a mid-cut or sheet.

The tests are carried out in a Vice with a radius of curvature of the jaws 5 mm at a temperature of 15−35 °C.

During the test shall be provided with a permanent adhesion of the sample to the surface of the jaws. Bend — bend sample from the initial position at 90° and straighten back up to the starting position. A half bend is considered a bend 90° without rectification.

The destruction of the sample is considered failure of the specimen or a crack of any length.

The obtained values of the number of bends round to the nearest integer or poluslova of inflection. The result of the test taking the arithmetic mean of the excesses of the four samples.

Rules for inflection is set at a confidence level of 0.97.

4.6. Samples for the determination of magnetic properties are made according to GOST 12119.0 — GOST 12119.8.

The first strip from the edges of the sample do not include.

Magnetic properties of the steel of all grades, except 3405, 3406, 3407, 3408 and 3409, determined on the same sample. The sample consists of the same number of strips cut evenly across the width of the selected segments or pages.

The magnetic properties of steel grades 3405, 3406, 3407, 3408 and 3409 determined on two samples made separately from each selected segment. Steel stamp set for the sample having the worst magnetic properties.

(Changed edition, Rev. N 3, 5).

4.7. Strips that make up the sample before determination of the magnetic properties should be subjected to annealing. Recommended mode annealing: heating to a temperature of 800−820 °C With the presence of up to 10 minutes in an atmosphere protecting against oxidation, or 3 min in air, or annealing in a muffle furnace in a neutral atmosphere at 780−800 °C, exposure for 1 h, cooling with the furnace to 300 °C.

In the event of disagreement — heating to a temperature of 800−820 °C being in a neutral protective atmosphere from 1.5 to 3 min for steel with insulating coating without impairing stanoevski, and steel without insulating coatings, and from 1.5 to 3 min. on air to steel with heat resistant insulating coating.

4.8. The magnetic properties determined in the apparatus Epstein GOST 12119.1.

Allowed measurement of the magnetic properties of other methods providing the required accuracy.

If there are differences in the magnetic properties determined in the apparatus Epstein.

Norms of specific magnetic losses and magnetic induction are installed in the coil or bundle at p = 0.95.

4.9. To determine the residual stresses from any point cut the test specimen magnetic losses in the leaf apparatus according to the GOST 12119.0 — GOST 12119.8.

Residual stress is determined by the difference of magnetic losses before and after annealing of the sample attributed to magnetic losses of the annealed sample.

The annealing of samples is performed according to the mode specified in clause 4.7.

Magnetic losses measured in the sheet units at a 12119.0 GOST — GOST 12119.8.

4.10. For the determination of the aging of the sample after determining the magnetic properties is subjected to aging according to the mode: heating up to 120 °C, exposure time 120 h and again determine the specific magnetic losses.

The ageing factor (), %, is calculated by the formula

,

where and is the specific magnetic losses before and after aging.

(Changed edition, Rev. N 4).

4.11. To measure the resistance coefficient and the thickness of the insulating heat-resistant coating on each segment or sheet is taken one sample with a width of 30−80 mm, and a length equal to the width selected to control the segment or sheet.

To determine the adhesive strength of the insulating heat-resistant coating with the metal from each segment or sheet select the specimen width of 30 mm and a length equal to the width of the segment or sheet.

4.12. The thickness of the coating is determined by the thickness of electromagnetic or other system that allows to measure with an error of less than 1 micron.

4.13. The ratio of the resistance of insulating coatings is determined according to GOST 12119.0 — GOST 12119.8 on deletecontacts install.

In determining the coefficient of resistance measurement is carried out on both samples at two sites on each side of the sample, i.e., eight times.

When calculating the resistance coefficient for steel-plated FLOOR, take the arithmetic mean value of the current strength of the eight measurements.

When calculating the resistance factor for steel coated with TSH, NS and take the average value of the current of the four measurements on each sample.

The result of taking the average value of the coefficient of resistance of the worst kind.

(Changed edition, Rev. N 5).

4.14. To determine the strength of adhesion of the coating to a metal sample is tightly pressed against the rod 20 mm in diameter and smoothly bent 90° around the web.

The sample is considered to pass the tests, if with its outer side has no cracks and delaminations. Delamination and cracks are determined visually.

4.15. The fill factor is determined on a sample composed of no less than 100 bands are taken to determine the magnetic properties, which before the test, remove the burrs. The sample is pressed evenly across the surface under pressure of 0.35 N/mm. The height of the compressed sample is measured with an error of less than 0.1 mm in four opposite places. For the height take the average results of four measurements.

The fill factor () is calculated by the formula

,

where is the mass of sample, kg, determined with an accuracy of 0.005 kg;

 — the volume of the sample after pressovaniya determined according to the measurement results of pack, m;

 — the density of steel, kg/m.

(Changed edition, Rev. N 1).

4.16. Methods for determining the sound insulating properties of the coating after heating to 800 °C and methods for determining the characteristics given in claim 2.15, it is determined by agreement between manufacturer and consumer.

Recommended test methods for heat-resistant electrical insulating coating on the neutral to the transformer oil and the oil resistant coating is provided in appendices 3 and 4.

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Marking, packaging, transportation and storage — by GOST 7566 with additions.

5.1.1. Individual segments of the coil must be connected by butt welding.

The turns of the coil at the weld should not be more than five times the thickness of the steel and must be marked.

The thickness of the steel at the weld shall not increase by more than the nominal thickness.

Cutting the ribbon, wound on a single winder, it is allowed to package without spacers between the coils.

Allowed packing into one bundle of sheets and winding into a roll of two strips of different batches of the same brand and the same size provided a reliable separation of the parties.

5.1.2. On the inner and outer turn of a roll of tape and labeled with the indication of the trademark of the manufacturer, steel grade, heat number, batch number, size and magnetic properties of steel. A bunch of rolls of tape label is put on the outer turn of each coil and an inner coil of extreme rolls.

5.1.3. The mass of steel in the packaging must be not less than 80 kg and not more than 5.0 t In agreement with the consumer allowed the increase of steel in the packaging in accordance with GOST 7566.

5.2. Coils and bundles of leaves are Packed in containers, providing safety of products in accordance with normative-technical documentation.

5.3. Rental transporterowych by all kinds of transport in accordance with cargo carriage regulations applicable to transport of this species.

Transport of steel by rail is carried out in covered wagons, platforms or open wagons with all types of shipments.

(Changed edition, Rev. N 5).

5.4. Rental in unopened manufacturer’s packaging must be stored in covered warehouses excluding ingress of moisture.

(Added, Rev. N 5).

APP 1A (reference). The value of magnetostriction at room temperature, measured by dynamic method at an amplitude of magnetic induction of 1.7 T and frequency 50 Hz on the annealed steel samples cut along the direction of rolling

ANNEX 1A
Reference

Magnetic induction , T	Amplitude (p-p) magnetostriction
1,65	2,0
1,68	1,7
1,70	1,5
1,74	1,2

ANNEX 1A. (Added, Rev. N 5).

APPENDIX 1. (Deleted, Rev. N 1).

ANNEX 2 (informative)

ANNEX 2
Reference

Steel grade	Mass fraction of silicon, %	The density of steel, kg/m	Electrical resistivity, Ohm·mm/m
3412, 3413, 3414, 3415, 3404, 3405, 3406, 3407, 3408	2,8−3,8	7650	0,45−0,50
3311	1,8−2,8	7750	0,40

Note. Chemical composition of steel is not standardized.


APPENDIX 2. (Changed edition, Rev. N 4, 5).

APPENDIX 3 (reference). METHODS OF TESTING INSULATING COATINGS ON ELECTRICAL STEEL TO NEUTRAL TO TRANSFORMER OIL

APPENDIX 3
Reference

The test is carried out by exposure of the package of plates of steel with the coating in a vessel with transformer oil at a temperature of (100±1) °C for 1000 h. the weight of the package strips 280х30 mm size is 0.5 kg, mass of oil — 0.3 kg. is carried out Simultaneously under the same conditions, the aging of the samples of pure oil.

The coating is considered to be neutral to the transformer oil, if the tangent of dielectric loss, acid value and content of water-soluble acids and alkalis oil, which was coated steel, has not increased by more than 15% in comparison with the characteristics of aged pure oil.

ANNEX 4 (reference). METHODS OF TESTING INSULATING COATINGS ON ELECTRICAL STEEL FOR RESISTANCE

ANNEX 4
Reference

The oil resistant insulation coating of electrical steel is evaluated after aging for 168 h of plate pack steel mass 0.5 kg and the size 280х30 mm in the vessel, containing 0.4 kg of transformer oil at a temperature of (150±2) °C. After incubation the sample plates are degreased and checked the strength of adhesion of the coating to steel in bending and coefficient of resistance insulation coating.

APPENDIX 5 (mandatory). Compliance vintage assortment GOST 21427.1−83 ST SEV 102−85

ANNEX 5
Mandatory

Compliance vintage assortment GOST 21427.1−83 ST SEV 102−85 given in table.1.

Table 1

GOST 21427.1−83		ST SEV 102−85
Steel grade	Thickness, mm	Category rental
3408	0,27	114−27−1
3407	0,27	120−27−1
3408	0,30	120−30−1
3407	0,30	126−30−1
3408	0,35	130−35−1
3407	0,35	136−35−1
3406	0,27	127−27−2
3405	0,27	138−27−2
3406	0,30	133−30−2
3405	0,30	140−30−2
3404	0,30	150−30−2
3406	0,35	143−35−2
3405	0,35	150−35−2
3404	0,35	160−35−2
-	089−27−3
3414	0,27	103−27−3
-	0,30	092−30−3
3415	0,30	097−30−3
-	107−30−3
-	-	102−35−3
3414	0,35	110−35−3
3413	0,35	130−35−3
3412	0,35	150−35−3
3414	0,50	150−50−3
3413	0,50	175−50−3
3412	0,50	210−50−3
3411	0,50	245−50−3
3311	0,80	-

Compliance with the requirements of GOST 21427.1−83 ST SEV 102−85 given in table.2.

Table 2

GOST 21427.1−83			ST SEV 102−85
Item	Content requirements		Item	Content requirements
1.6. Table.2	Sets more stringent requirements on limit deviations for thickness for thickness 0.27 and 0.30 mm for normal and high precision rolling:		2.5. Table.2
normal ±0,02	increased ±0,01	Normal ±0,03 Increased ±0,02
1.12	Establishes a more stringent standard flatness for steel coils of the 1st class:		2.10
not more than 1%		Not more than 1.5%
2.6. Table.7	Sets a greater number of kinks (arithmetic mean) for samples tested steel with a thickness of 0.27 and 0.30 mm:		2.6. Table.6
at least 4		At least 3

APPENDIX 5. (Added, Rev. N 2).



The electronic text of the document
prepared by JSC «Code» and checked by:
the official publication of the
Rolled steel special
assignments: Sat. Standards. -
M.: IPK Publishing house of standards, 2003